I'm very happy with my hybrid but yes I would get rid of it in favor of a biodiesel when biodiesel is more widely available. Going to Mickey Dee's for a fill up sounds cool but in reality it would be a pain in the butt. I like the idea of keeping polution as low as possible but the big thing for me is the renewable aspect.

They do sell real bio-diesel for three something a gallon in a handful of stations. If I lived by one I would buy a TDI for sure.